what does Ophelia mean?

In act four, scene five, Ophelia is speaking to King Claudius when she utters the phrase "Lord, we know what we are, but know not what we may be." (43). I believe this statement says that we know where alive but what is our purpose now. Now she can be compared to hamlet directly because in line 24 act5 she says to Girtrude "how should i your true love know from one another?". This can obviously be compared to Hamlets love for his mother and currently her father has died and that another similarity she has to Hamlet. So over all I believe shes saying i know whats happened but i don't know whats to come.